1. First Hour - How can one measure intelligence?
Intelligence I
First Hour - How can one measure intelligence?
What is Intelligence?
Early Intelligence testing
Producing a good intelligence test
The normal distribution
Reliability and validity
Longitudinal and cross sectional studies of
intelligence

2. Intelligence: The ability to learn from experience
The ability to adapt to the surrounding environment
The ability to understand and control one’s own
thinking process (metacognition)
BUT one must understand the role of culture in
intelligence….

3. The Stanford-Binet version of IQ:
The WAIS version of IQ:

4. Test: “...a standardized instrument, consisting of items, for obtaining a reliable sample of some valid aspect of a person’s behavior (e.g. thinking and reasoning abilities).”
standardized
items
reliable
valid

6. Reliability
Test-retest reliability
Alternate-forms reliability
Split-half reliability
Validity
Criterion validity - real life measures
Content validity – items measure what they
propose to measure
Construct validity – test captures the
multi-dimensional nature of the quality measured

7. Longitudinal vs. cross-sectional comparisons
(cell contains birth year) 60
1944
1944
Age of individuals 50
1944
1954
1944 40
1964
Year in which the data were collected

8. IQ and age: cross-sectional vs. longitudinal comparisons
105 —
100 —
95 —
90 —
85 —
0 — |
IQ scores
Age in years
longitudinal
(single group)
cross-sectional
(different groups)